Electrode holder



FIG. 1 is an elevational view of the righthand side of an electrode holder embodying my new design;

FIG. 2 is an elevational view of the lefthand side thereof;

FIG. 3 is a plan view thereof;

FIG. 4 is an inverted plan view thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for an electrode holder, substantially as shown and described. 